In this study, the 2 models which have decks at water tight compaerment as Large Passenger Ship (110,000 gross tonnage) were developed, and the damaged ship's behaviors in intermediate stages of flooding were experimentally investigated. In some cases, large heel angle were measured for both models. However, the time to reach to the maximam heel angle for these ships have significantly differens from the safety point of view. It was confirmed that the difference is caused by the difference of flooding verocity from damaged opeing affected by the size of the opening and air compression in compertments.